package bzu.info.software;  
  
public class Circle {  
double r,area;  
public Circle(double r){  
    this.r=r;  
}  
public void setR(double r) {  
    this.r=r;  
}  
public double getR() {  
    return r;  
}  
public double getArea() {  
    area=3.14*r*r;  
    return area;  
}  
} 